Fire box



April 23, 1929. w. DUFF 1,710,087-

' FIRE BOX Filed May 6, 1927 2 KIQNVENTOR.

a BY Man/1w M w I AAQATTORNEY Patented Apr. 23, 1929.

Finn Box.

Application filed May 6,

My invention relates to improvements in lire boxes, particularly those employed for use in, connection with stean'i boilers, and. which employ hydro-carbon fuel.

One of the objects of my invention is to provide a novel tire box of the hind described,

which is simple, cheap, durable, which is eco nomical in the use of fuel, and which ellicient in its operation[ My invention provides further a novel bail'le wall which serves to effectively intermingle and diffuse the gaseous products of combustion, and which has means for holding back and guiding forwardly said gaseous products delaying their discharge from the tire box, and thereby retaining therein the heat produced therefrom.

The novel features of my invention are hereinafter fully described and claimed.

In the accompanying drawings, which illustrate the preferred en'ibodiinent of my invention,

F 1 is a side elc urtion, partly broken away, of a. boiler of usual type, provided with my improved lire box.

Fig. 2 is a horizontal section on the line 22 of Fig. 1.

Fig. 3 is a view partly in front elevation and partly in vertical section on the line 33 of Fig. 1. y

Fig. 4 is a section on the line l l of Fig. 2.

Similar reference characters designate similar parts in the different views.

1 designates a. boiler of usual tubular stationary type having a front portion 2 disposed over a tire box 3, 'tl'ielatter being pro vided with an inner lining a along its side walls, whichlining is preferably of refrac tory material, such as fire clay or briclc.

In the fire box 3 is a transverse rear wall 5, which is preferably of refractory niaterial and which at its front side has a portion which inclines upwardly and forwardly, and preferably concave.

In the lire box 3 forward of and spaced from the rear wall 5 and extending to the side walls l, is a transverse perforate baille wall, 6, which is provided with foriwu'dly and rearwardly extending passages 7.

In the fire box 3 forward of and. spaced from the wall 6' is a wall of similar construction, designated. by 8 and which is also provided with forwardly and rearwardly extendinggas passages 7.

The front sides of the walls 6 and 8 have preferably the same :lorin as the front side of the rear wall 5. T

poi-thin i) of each of thefu; extends preferably dowuwari y an wardly from the top of the wall. noted that the concave arcuatx, fr tion of each of the walls, 5, (3, ant 8 ilorwardly and upwardly to a horizontal plane which is tangent to the arc. The effect; produced by this COHSiLl'UQtlOEl is to cause the gaseous products to travel urnvardly and he eoncavely inclined forwardly and thence, due to their nioinen tuin, downwardly and rearwardly, so as to eliecta. whirling nioven'ient around the cen-' ter of the arc, thus materially delaying their progress from the lire box.

Forprojectingthe gaseous products of burning fuel against the front side of the frontwall 8, any suitable means may be einployed. In the drawings, I have shown for this purpose two oil burners 10, which are res actively provided with fuel oil by means of two pipes 11, which extend tl'irough the front side of the lire box and which are connected at their outer ends to a supply pipe 12, which is connected to any suitable source of oilsupply, not shown.

In the operation of my inventionthe gaseous products of combustion are projected rearwardly through the lire box against the gaseous products is projected upwardly and forwardly, as is indicated. by the arrows forward of said wall.

A portion of the gaseous products passes through the openings 7 in the wall 8. and a part of the products so passing strikes the front side of the wall 6 and is upwardly and :lorwardly diverted, as indicated by the ar rows adjacent to and at the front of the wall 6.

Some of the gaseous products pass through the passages T in the wall 6 and strike the front side of the rear wall 5, which causes said products to travel upwardly and forwardly as indicated by the arrows forward of and adjacent to the rear wall. Owing to the draft through the passages 7 of the walls 6 andyS, portions of the gaseous prodilicts which are given a whirling movement at the front of said walls, as has been described, pass rearwardly through said passages, thus subjecting them to further heating by con tact with the hot wa ls, andalso delaying their progress through the tire box. l

By means of such lOfELltlttlllOl'lfllltl change of course of the gaseous products during ext e ads front side of thewall S. A portion of the their passage from the front wall SthrOugh the fire box, a niaxiniunramount ottheir heat is retained in the fire box and ,isfconducted therefrom to the portion 2 of the 'boiler which extends over and is spaced from the walls 5, Sand 8. By this means-a maximum amount of water in the boiler is heated with a minimumotfueh The gases, with air ,mingled therewith, pass through the fire box and into and through the tubes 13, provided in: the lower and rear portion of the boilervl and from thence through'the usual rear'spacel i, in the boiler, into and through thetuhes 715; which extend in; the usual manner into theflorward extension: 2 of the boiler and from thence to the atmosphere through the usual smoke V stack 16. a

' verse wall forward of and spaced from the rear wall and having passages extending rearward'ly therethrougln-the upper front portion ofsaid transversewall havinga con= cave arcuate portion extending; upwardly and forwardly to a horizontal plane that is tangent to'thearo at its upper end;

Inltestimony WhQIQOfI' have signed my name-tocthis specifieationz- NEL'SQN \V; DUFF. 

